20545513 has 8 divisors (see below), whose sum is σ = 20898176. Its totient is φ = 20196000.

The previous prime is 20545493. The next prime is 20545531. The reversal of 20545513 is 31554502.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20545513 - 2⁹ = 20545001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20545573) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14893 + ... + 16213.

It is an arithmetic number, because the mean of its divisors is an integer number (2612272).

Almost surely, 2^20545513 is an apocalyptic number.

It is an amenable number.

20545513 is a deficient number, since it is larger than the sum of its proper divisors (352663).

20545513 is a wasteful number, since it uses less digits than its factorization.

20545513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1575.

The product of its (nonzero) digits is 3000, while the sum is 25.

The square root of 20545513 is about 4532.7158525546. The cubic root of 20545513 is about 273.8875744212.

The spelling of 20545513 in words is "twenty million, five hundred forty-five thousand, five hundred thirteen".